Update to kernel headers v4.7.2.

Change-Id: Ie38921bc18a94316dc708b9869e53c2d80c4fed1

12 files changed, 297 insertions, 15 deletions

diff --git a/original/uapi/asm-x86/asm/bootparam.h b/original/uapi/asm-x86/asm/bootparam.h
index 3292543..c18ce67 100644
--- a/original/uapi/asm-x86/asm/bootparam.h
+++ b/original/uapi/asm-x86/asm/bootparam.h
@@ -157,7 +157,46 @@ struct boot_params {
 	__u8  _pad9[276];				/* 0xeec */
 } __attribute__((packed));
 
-enum {
+/**
+ * enum x86_hardware_subarch - x86 hardware subarchitecture
+ *
+ * The x86 hardware_subarch and hardware_subarch_data were added as of the x86
+ * boot protocol 2.07 to help distinguish and support custom x86 boot
+ * sequences. This enum represents accepted values for the x86
+ * hardware_subarch.  Custom x86 boot sequences (not X86_SUBARCH_PC) do not
+ * have or simply *cannot* make use of natural stubs like BIOS or EFI, the
+ * hardware_subarch can be used on the Linux entry path to revector to a
+ * subarchitecture stub when needed. This subarchitecture stub can be used to
+ * set up Linux boot parameters or for special care to account for nonstandard
+ * handling of page tables.
+ *
+ * These enums should only ever be used by x86 code, and the code that uses
+ * it should be well contained and compartamentalized.
+ *
+ * KVM and Xen HVM do not have a subarch as these are expected to follow
+ * standard x86 boot entries. If there is a genuine need for "hypervisor" type
+ * that should be considered separately in the future. Future guest types
+ * should seriously consider working with standard x86 boot stubs such as
+ * the BIOS or EFI boot stubs.
+ *
+ * WARNING: this enum is only used for legacy hacks, for platform features that
+ *	    are not easily enumerated or discoverable. You should not ever use
+ *	    this for new features.
+ *
+ * @X86_SUBARCH_PC: Should be used if the hardware is enumerable using standard
+ *	PC mechanisms (PCI, ACPI) and doesn't need a special boot flow.
+ * @X86_SUBARCH_LGUEST: Used for x86 hypervisor demo, lguest
+ * @X86_SUBARCH_XEN: Used for Xen guest types which follow the PV boot path,
+ * 	which start at asm startup_xen() entry point and later jump to the C
+ * 	xen_start_kernel() entry point. Both domU and dom0 type of guests are
+ * 	currently supportd through this PV boot path.
+ * @X86_SUBARCH_INTEL_MID: Used for Intel MID (Mobile Internet Device) platform
+ *	systems which do not have the PCI legacy interfaces.
+ * @X86_SUBARCH_CE4100: Used for Intel CE media processor (CE4100) SoC for
+ * 	for settop boxes and media devices, the use of a subarch for CE4100
+ * 	is more of a hack...
+ */
+enum x86_hardware_subarch {
 	X86_SUBARCH_PC = 0,
 	X86_SUBARCH_LGUEST,
 	X86_SUBARCH_XEN,
diff --git a/original/uapi/asm-x86/asm/hyperv.h b/original/uapi/asm-x86/asm/hyperv.h
index 040d408..9b1a918 100644
--- a/original/uapi/asm-x86/asm/hyperv.h
+++ b/original/uapi/asm-x86/asm/hyperv.h
@@ -226,7 +226,9 @@
 		(~((1ull << HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT) - 1))
 
 /* Declare the various hypercall operations. */
-#define HV_X64_HV_NOTIFY_LONG_SPIN_WAIT		0x0008
+#define HVCALL_NOTIFY_LONG_SPIN_WAIT		0x0008
+#define HVCALL_POST_MESSAGE			0x005c
+#define HVCALL_SIGNAL_EVENT			0x005d
 
 #define HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE		0x00000001
 #define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT	12
@@ -269,4 +271,96 @@ typedef struct _HV_REFERENCE_TSC_PAGE {
 #define HV_SYNIC_SINT_AUTO_EOI		(1ULL << 17)
 #define HV_SYNIC_SINT_VECTOR_MASK	(0xFF)
 
+#define HV_SYNIC_STIMER_COUNT		(4)
+
+/* Define synthetic interrupt controller message constants. */
+#define HV_MESSAGE_SIZE			(256)
+#define HV_MESSAGE_PAYLOAD_BYTE_COUNT	(240)
+#define HV_MESSAGE_PAYLOAD_QWORD_COUNT	(30)
+
+/* Define hypervisor message types. */
+enum hv_message_type {
+	HVMSG_NONE			= 0x00000000,
+
+	/* Memory access messages. */
+	HVMSG_UNMAPPED_GPA		= 0x80000000,
+	HVMSG_GPA_INTERCEPT		= 0x80000001,
+
+	/* Timer notification messages. */
+	HVMSG_TIMER_EXPIRED			= 0x80000010,
+
+	/* Error messages. */
+	HVMSG_INVALID_VP_REGISTER_VALUE	= 0x80000020,
+	HVMSG_UNRECOVERABLE_EXCEPTION	= 0x80000021,
+	HVMSG_UNSUPPORTED_FEATURE		= 0x80000022,
+
+	/* Trace buffer complete messages. */
+	HVMSG_EVENTLOG_BUFFERCOMPLETE	= 0x80000040,
+
+	/* Platform-specific processor intercept messages. */
+	HVMSG_X64_IOPORT_INTERCEPT		= 0x80010000,
+	HVMSG_X64_MSR_INTERCEPT		= 0x80010001,
+	HVMSG_X64_CPUID_INTERCEPT		= 0x80010002,
+	HVMSG_X64_EXCEPTION_INTERCEPT	= 0x80010003,
+	HVMSG_X64_APIC_EOI			= 0x80010004,
+	HVMSG_X64_LEGACY_FP_ERROR		= 0x80010005
+};
+
+/* Define synthetic interrupt controller message flags. */
+union hv_message_flags {
+	__u8 asu8;
+	struct {
+		__u8 msg_pending:1;
+		__u8 reserved:7;
+	};
+};
+
+/* Define port identifier type. */
+union hv_port_id {
+	__u32 asu32;
+	struct {
+		__u32 id:24;
+		__u32 reserved:8;
+	} u;
+};
+
+/* Define synthetic interrupt controller message header. */
+struct hv_message_header {
+	__u32 message_type;
+	__u8 payload_size;
+	union hv_message_flags message_flags;
+	__u8 reserved[2];
+	union {
+		__u64 sender;
+		union hv_port_id port;
+	};
+};
+
+/* Define synthetic interrupt controller message format. */
+struct hv_message {
+	struct hv_message_header header;
+	union {
+		__u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+	} u;
+};
+
+/* Define the synthetic interrupt message page layout. */
+struct hv_message_page {
+	struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
+};
+
+/* Define timer message payload structure. */
+struct hv_timer_message_payload {
+	__u32 timer_index;
+	__u32 reserved;
+	__u64 expiration_time;	/* When the timer expired */
+	__u64 delivery_time;	/* When the message was delivered */
+};
+
+#define HV_STIMER_ENABLE		(1ULL << 0)
+#define HV_STIMER_PERIODIC		(1ULL << 1)
+#define HV_STIMER_LAZY			(1ULL << 2)
+#define HV_STIMER_AUTOENABLE		(1ULL << 3)
+#define HV_STIMER_SINT(config)		(__u8)(((config) >> 16) & 0x0F)
+
 #endif
diff --git a/original/uapi/asm-x86/asm/kvm.h b/original/uapi/asm-x86/asm/kvm.h
index cd54147..739c0c5 100644
--- a/original/uapi/asm-x86/asm/kvm.h
+++ b/original/uapi/asm-x86/asm/kvm.h
@@ -216,9 +216,9 @@ struct kvm_cpuid_entry2 {
 	__u32 padding[3];
 };
 
-#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX		BIT(0)
-#define KVM_CPUID_FLAG_STATEFUL_FUNC		BIT(1)
-#define KVM_CPUID_FLAG_STATE_READ_NEXT		BIT(2)
+#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX		(1 << 0)
+#define KVM_CPUID_FLAG_STATEFUL_FUNC		(1 << 1)
+#define KVM_CPUID_FLAG_STATE_READ_NEXT		(1 << 2)
 
 /* for KVM_SET_CPUID2 */
 struct kvm_cpuid2 {
diff --git a/original/uapi/asm-x86/asm/mce.h b/original/uapi/asm-x86/asm/mce.h
index 03429da..2184943 100644
--- a/original/uapi/asm-x86/asm/mce.h
+++ b/original/uapi/asm-x86/asm/mce.h
@@ -16,7 +16,7 @@ struct mce {
 	__u8  cpuvendor;	/* cpu vendor as encoded in system.h */
 	__u8  inject_flags;	/* software inject flags */
 	__u8  severity;
-	__u8  usable_addr;
+	__u8  pad;
 	__u32 cpuid;	/* CPUID 1 EAX */
 	__u8  cs;		/* code segment */
 	__u8  bank;	/* machine check bank */
diff --git a/original/uapi/asm-x86/asm/mman.h b/original/uapi/asm-x86/asm/mman.h
index 513b05f..39bca7f 100644
--- a/original/uapi/asm-x86/asm/mman.h
+++ b/original/uapi/asm-x86/asm/mman.h
@@ -6,6 +6,28 @@
 #define MAP_HUGE_2MB    (21 << MAP_HUGE_SHIFT)
 #define MAP_HUGE_1GB    (30 << MAP_HUGE_SHIFT)
 
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+/*
+ * Take the 4 protection key bits out of the vma->vm_flags
+ * value and turn them in to the bits that we can put in
+ * to a pte.
+ *
+ * Only override these if Protection Keys are available
+ * (which is only on 64-bit).
+ */
+#define arch_vm_get_page_prot(vm_flags)	__pgprot(	\
+		((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) |	\
+		((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) |	\
+		((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) |	\
+		((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
+
+#define arch_calc_vm_prot_bits(prot, key) (		\
+		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
+		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
+		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
+		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
+#endif
+
 #include <asm-generic/mman.h>
 
 #endif /* _ASM_X86_MMAN_H */
diff --git a/original/uapi/asm-x86/asm/processor-flags.h b/original/uapi/asm-x86/asm/processor-flags.h
index 79887ab..567de50 100644
--- a/original/uapi/asm-x86/asm/processor-flags.h
+++ b/original/uapi/asm-x86/asm/processor-flags.h
@@ -118,6 +118,8 @@
 #define X86_CR4_SMEP		_BITUL(X86_CR4_SMEP_BIT)
 #define X86_CR4_SMAP_BIT	21 /* enable SMAP support */
 #define X86_CR4_SMAP		_BITUL(X86_CR4_SMAP_BIT)
+#define X86_CR4_PKE_BIT		22 /* enable Protection Keys support */
+#define X86_CR4_PKE		_BITUL(X86_CR4_PKE_BIT)
 
 /*
  * x86-64 Task Priority Register, CR8
diff --git a/original/uapi/asm-x86/asm/sigcontext.h b/original/uapi/asm-x86/asm/sigcontext.h
index d485232..62d4111 100644
--- a/original/uapi/asm-x86/asm/sigcontext.h
+++ b/original/uapi/asm-x86/asm/sigcontext.h
@@ -256,7 +256,7 @@ struct sigcontext_64 {
 	__u16				cs;
 	__u16				gs;
 	__u16				fs;
-	__u16				__pad0;
+	__u16				ss;
 	__u64				err;
 	__u64				trapno;
 	__u64				oldmask;
@@ -341,9 +341,37 @@ struct sigcontext {
 	__u64				rip;
 	__u64				eflags;		/* RFLAGS */
 	__u16				cs;
+
+	/*
+	 * Prior to 2.5.64 ("[PATCH] x86-64 updates for 2.5.64-bk3"),
+	 * Linux saved and restored fs and gs in these slots.  This
+	 * was counterproductive, as fsbase and gsbase were never
+	 * saved, so arch_prctl was presumably unreliable.
+	 *
+	 * These slots should never be reused without extreme caution:
+	 *
+	 *  - Some DOSEMU versions stash fs and gs in these slots manually,
+	 *    thus overwriting anything the kernel expects to be preserved
+	 *    in these slots.
+	 *
+	 *  - If these slots are ever needed for any other purpose,
+	 *    there is some risk that very old 64-bit binaries could get
+	 *    confused.  I doubt that many such binaries still work,
+	 *    though, since the same patch in 2.5.64 also removed the
+	 *    64-bit set_thread_area syscall, so it appears that there
+	 *    is no TLS API beyond modify_ldt that works in both pre-
+	 *    and post-2.5.64 kernels.
+	 *
+	 * If the kernel ever adds explicit fs, gs, fsbase, and gsbase
+	 * save/restore, it will most likely need to be opt-in and use
+	 * different context slots.
+	 */
 	__u16				gs;
 	__u16				fs;
-	__u16				__pad0;
+	union {
+		__u16			ss;	/* If UC_SIGCONTEXT_SS */
+		__u16			__pad0;	/* Alias name for old (!UC_SIGCONTEXT_SS) user-space */
+	};
 	__u64				err;
 	__u64				trapno;
 	__u64				oldmask;
diff --git a/original/uapi/asm-x86/asm/svm.h b/original/uapi/asm-x86/asm/svm.h
index 8a4add8..3725e14 100644
--- a/original/uapi/asm-x86/asm/svm.h
+++ b/original/uapi/asm-x86/asm/svm.h
@@ -2,10 +2,12 @@
 #define _UAPI__SVM_H
 
 #define SVM_EXIT_READ_CR0      0x000
+#define SVM_EXIT_READ_CR2      0x002
 #define SVM_EXIT_READ_CR3      0x003
 #define SVM_EXIT_READ_CR4      0x004
 #define SVM_EXIT_READ_CR8      0x008
 #define SVM_EXIT_WRITE_CR0     0x010
+#define SVM_EXIT_WRITE_CR2     0x012
 #define SVM_EXIT_WRITE_CR3     0x013
 #define SVM_EXIT_WRITE_CR4     0x014
 #define SVM_EXIT_WRITE_CR8     0x018
@@ -73,15 +75,19 @@
 #define SVM_EXIT_MWAIT_COND    0x08c
 #define SVM_EXIT_XSETBV        0x08d
 #define SVM_EXIT_NPF           0x400
+#define SVM_EXIT_AVIC_INCOMPLETE_IPI		0x401
+#define SVM_EXIT_AVIC_UNACCELERATED_ACCESS	0x402
 
 #define SVM_EXIT_ERR           -1
 
 #define SVM_EXIT_REASONS \
 	{ SVM_EXIT_READ_CR0,    "read_cr0" }, \
+	{ SVM_EXIT_READ_CR2,    "read_cr2" }, \
 	{ SVM_EXIT_READ_CR3,    "read_cr3" }, \
 	{ SVM_EXIT_READ_CR4,    "read_cr4" }, \
 	{ SVM_EXIT_READ_CR8,    "read_cr8" }, \
 	{ SVM_EXIT_WRITE_CR0,   "write_cr0" }, \
+	{ SVM_EXIT_WRITE_CR2,   "write_cr2" }, \
 	{ SVM_EXIT_WRITE_CR3,   "write_cr3" }, \
 	{ SVM_EXIT_WRITE_CR4,   "write_cr4" }, \
 	{ SVM_EXIT_WRITE_CR8,   "write_cr8" }, \
@@ -89,32 +95,66 @@
 	{ SVM_EXIT_READ_DR1,    "read_dr1" }, \
 	{ SVM_EXIT_READ_DR2,    "read_dr2" }, \
 	{ SVM_EXIT_READ_DR3,    "read_dr3" }, \
+	{ SVM_EXIT_READ_DR4,    "read_dr4" }, \
+	{ SVM_EXIT_READ_DR5,    "read_dr5" }, \
+	{ SVM_EXIT_READ_DR6,    "read_dr6" }, \
+	{ SVM_EXIT_READ_DR7,    "read_dr7" }, \
 	{ SVM_EXIT_WRITE_DR0,   "write_dr0" }, \
 	{ SVM_EXIT_WRITE_DR1,   "write_dr1" }, \
 	{ SVM_EXIT_WRITE_DR2,   "write_dr2" }, \
 	{ SVM_EXIT_WRITE_DR3,   "write_dr3" }, \
+	{ SVM_EXIT_WRITE_DR4,   "write_dr4" }, \
 	{ SVM_EXIT_WRITE_DR5,   "write_dr5" }, \
+	{ SVM_EXIT_WRITE_DR6,   "write_dr6" }, \
 	{ SVM_EXIT_WRITE_DR7,   "write_dr7" }, \
+	{ SVM_EXIT_EXCP_BASE + DE_VECTOR,       "DE excp" }, \
 	{ SVM_EXIT_EXCP_BASE + DB_VECTOR,       "DB excp" }, \
 	{ SVM_EXIT_EXCP_BASE + BP_VECTOR,       "BP excp" }, \
+	{ SVM_EXIT_EXCP_BASE + OF_VECTOR,       "OF excp" }, \
+	{ SVM_EXIT_EXCP_BASE + BR_VECTOR,       "BR excp" }, \
 	{ SVM_EXIT_EXCP_BASE + UD_VECTOR,       "UD excp" }, \
-	{ SVM_EXIT_EXCP_BASE + PF_VECTOR,       "PF excp" }, \
 	{ SVM_EXIT_EXCP_BASE + NM_VECTOR,       "NM excp" }, \
+	{ SVM_EXIT_EXCP_BASE + DF_VECTOR,       "DF excp" }, \
+	{ SVM_EXIT_EXCP_BASE + TS_VECTOR,       "TS excp" }, \
+	{ SVM_EXIT_EXCP_BASE + NP_VECTOR,       "NP excp" }, \
+	{ SVM_EXIT_EXCP_BASE + SS_VECTOR,       "SS excp" }, \
+	{ SVM_EXIT_EXCP_BASE + GP_VECTOR,       "GP excp" }, \
+	{ SVM_EXIT_EXCP_BASE + PF_VECTOR,       "PF excp" }, \
+	{ SVM_EXIT_EXCP_BASE + MF_VECTOR,       "MF excp" }, \
 	{ SVM_EXIT_EXCP_BASE + AC_VECTOR,       "AC excp" }, \
 	{ SVM_EXIT_EXCP_BASE + MC_VECTOR,       "MC excp" }, \
+	{ SVM_EXIT_EXCP_BASE + XM_VECTOR,       "XF excp" }, \
 	{ SVM_EXIT_INTR,        "interrupt" }, \
 	{ SVM_EXIT_NMI,         "nmi" }, \
 	{ SVM_EXIT_SMI,         "smi" }, \
 	{ SVM_EXIT_INIT,        "init" }, \
 	{ SVM_EXIT_VINTR,       "vintr" }, \
+	{ SVM_EXIT_CR0_SEL_WRITE, "cr0_sel_write" }, \
+	{ SVM_EXIT_IDTR_READ,   "read_idtr" }, \
+	{ SVM_EXIT_GDTR_READ,   "read_gdtr" }, \
+	{ SVM_EXIT_LDTR_READ,   "read_ldtr" }, \
+	{ SVM_EXIT_TR_READ,     "read_rt" }, \
+	{ SVM_EXIT_IDTR_WRITE,  "write_idtr" }, \
+	{ SVM_EXIT_GDTR_WRITE,  "write_gdtr" }, \
+	{ SVM_EXIT_LDTR_WRITE,  "write_ldtr" }, \
+	{ SVM_EXIT_TR_WRITE,    "write_rt" }, \
+	{ SVM_EXIT_RDTSC,       "rdtsc" }, \
+	{ SVM_EXIT_RDPMC,       "rdpmc" }, \
+	{ SVM_EXIT_PUSHF,       "pushf" }, \
+	{ SVM_EXIT_POPF,        "popf" }, \
 	{ SVM_EXIT_CPUID,       "cpuid" }, \
+	{ SVM_EXIT_RSM,         "rsm" }, \
+	{ SVM_EXIT_IRET,        "iret" }, \
+	{ SVM_EXIT_SWINT,       "swint" }, \
 	{ SVM_EXIT_INVD,        "invd" }, \
+	{ SVM_EXIT_PAUSE,       "pause" }, \
 	{ SVM_EXIT_HLT,         "hlt" }, \
 	{ SVM_EXIT_INVLPG,      "invlpg" }, \
 	{ SVM_EXIT_INVLPGA,     "invlpga" }, \
 	{ SVM_EXIT_IOIO,        "io" }, \
 	{ SVM_EXIT_MSR,         "msr" }, \
 	{ SVM_EXIT_TASK_SWITCH, "task_switch" }, \
+	{ SVM_EXIT_FERR_FREEZE, "ferr_freeze" }, \
 	{ SVM_EXIT_SHUTDOWN,    "shutdown" }, \
 	{ SVM_EXIT_VMRUN,       "vmrun" }, \
 	{ SVM_EXIT_VMMCALL,     "hypercall" }, \
@@ -123,11 +163,16 @@
 	{ SVM_EXIT_STGI,        "stgi" }, \
 	{ SVM_EXIT_CLGI,        "clgi" }, \
 	{ SVM_EXIT_SKINIT,      "skinit" }, \
+	{ SVM_EXIT_RDTSCP,      "rdtscp" }, \
+	{ SVM_EXIT_ICEBP,       "icebp" }, \
 	{ SVM_EXIT_WBINVD,      "wbinvd" }, \
 	{ SVM_EXIT_MONITOR,     "monitor" }, \
 	{ SVM_EXIT_MWAIT,       "mwait" }, \
 	{ SVM_EXIT_XSETBV,      "xsetbv" }, \
-	{ SVM_EXIT_NPF,         "npf" }
+	{ SVM_EXIT_NPF,         "npf" }, \
+	{ SVM_EXIT_AVIC_INCOMPLETE_IPI,		"avic_incomplete_ipi" }, \
+	{ SVM_EXIT_AVIC_UNACCELERATED_ACCESS,   "avic_unaccelerated_access" }, \
+	{ SVM_EXIT_ERR,         "invalid_guest_state" }
 
 
 #endif /* _UAPI__SVM_H */
diff --git a/original/uapi/asm-x86/asm/ucontext.h b/original/uapi/asm-x86/asm/ucontext.h
index b7c29c8..e3d1ec9 100644
--- a/original/uapi/asm-x86/asm/ucontext.h
+++ b/original/uapi/asm-x86/asm/ucontext.h
@@ -1,11 +1,54 @@
 #ifndef _ASM_X86_UCONTEXT_H
 #define _ASM_X86_UCONTEXT_H
 
-#define UC_FP_XSTATE	0x1	/* indicates the presence of extended state
-				 * information in the memory layout pointed
-				 * by the fpstate pointer in the ucontext's
-				 * sigcontext struct (uc_mcontext).
-				 */
+/*
+ * Indicates the presence of extended state information in the memory
+ * layout pointed by the fpstate pointer in the ucontext's sigcontext
+ * struct (uc_mcontext).
+ */
+#define UC_FP_XSTATE	0x1
+
+#ifdef __x86_64__
+/*
+ * UC_SIGCONTEXT_SS will be set when delivering 64-bit or x32 signals on
+ * kernels that save SS in the sigcontext.  All kernels that set
+ * UC_SIGCONTEXT_SS will correctly restore at least the low 32 bits of esp
+ * regardless of SS (i.e. they implement espfix).
+ *
+ * Kernels that set UC_SIGCONTEXT_SS will also set UC_STRICT_RESTORE_SS
+ * when delivering a signal that came from 64-bit code.
+ *
+ * Sigreturn restores SS as follows:
+ *
+ * if (saved SS is valid || UC_STRICT_RESTORE_SS is set ||
+ *     saved CS is not 64-bit)
+ *         new SS = saved SS  (will fail IRET and signal if invalid)
+ * else
+ *         new SS = a flat 32-bit data segment
+ *
+ * This behavior serves three purposes:
+ *
+ * - Legacy programs that construct a 64-bit sigcontext from scratch
+ *   with zero or garbage in the SS slot (e.g. old CRIU) and call
+ *   sigreturn will still work.
+ *
+ * - Old DOSEMU versions sometimes catch a signal from a segmented
+ *   context, delete the old SS segment (with modify_ldt), and change
+ *   the saved CS to a 64-bit segment.  These DOSEMU versions expect
+ *   sigreturn to send them back to 64-bit mode without killing them,
+ *   despite the fact that the SS selector when the signal was raised is
+ *   no longer valid.  UC_STRICT_RESTORE_SS will be clear, so the kernel
+ *   will fix up SS for these DOSEMU versions.
+ *
+ * - Old and new programs that catch a signal and return without
+ *   modifying the saved context will end up in exactly the state they
+ *   started in, even if they were running in a segmented context when
+ *   the signal was raised..  Old kernels would lose track of the
+ *   previous SS value.
+ */
+#define UC_SIGCONTEXT_SS	0x2
+#define UC_STRICT_RESTORE_SS	0x4
+#endif
 
 #include <asm-generic/ucontext.h>
 
diff --git a/original/uapi/asm-x86/asm/unistd_32.h b/original/uapi/asm-x86/asm/unistd_32.h
index 30ff8fc..abeaf40 100644
--- a/original/uapi/asm-x86/asm/unistd_32.h
+++ b/original/uapi/asm-x86/asm/unistd_32.h
@@ -374,5 +374,8 @@
 #define __NR_userfaultfd 374
 #define __NR_membarrier 375
 #define __NR_mlock2 376
+#define __NR_copy_file_range 377
+#define __NR_preadv2 378
+#define __NR_pwritev2 379
 
 #endif /* _ASM_X86_UNISTD_32_H */
diff --git a/original/uapi/asm-x86/asm/unistd_64.h b/original/uapi/asm-x86/asm/unistd_64.h
index c8f7959..73c3d1f 100644
--- a/original/uapi/asm-x86/asm/unistd_64.h
+++ b/original/uapi/asm-x86/asm/unistd_64.h
@@ -327,5 +327,8 @@
 #define __NR_userfaultfd 323
 #define __NR_membarrier 324
 #define __NR_mlock2 325
+#define __NR_copy_file_range 326
+#define __NR_preadv2 327
+#define __NR_pwritev2 328
 
 #endif /* _ASM_X86_UNISTD_64_H */
diff --git a/original/uapi/asm-x86/asm/unistd_x32.h b/original/uapi/asm-x86/asm/unistd_x32.h
index 27003f3..0230779 100644
--- a/original/uapi/asm-x86/asm/unistd_x32.h
+++ b/original/uapi/asm-x86/asm/unistd_x32.h
@@ -282,6 +282,7 @@
 #define __NR_userfaultfd (__X32_SYSCALL_BIT + 323)
 #define __NR_membarrier (__X32_SYSCALL_BIT + 324)
 #define __NR_mlock2 (__X32_SYSCALL_BIT + 325)
+#define __NR_copy_file_range (__X32_SYSCALL_BIT + 326)
 #define __NR_rt_sigaction (__X32_SYSCALL_BIT + 512)
 #define __NR_rt_sigreturn (__X32_SYSCALL_BIT + 513)
 #define __NR_ioctl (__X32_SYSCALL_BIT + 514)
@@ -305,7 +306,9 @@
 #define __NR_vmsplice (__X32_SYSCALL_BIT + 532)
 #define __NR_move_pages (__X32_SYSCALL_BIT + 533)
 #define __NR_preadv (__X32_SYSCALL_BIT + 534)
+#define __NR_preadv2 (__X32_SYSCALL_BIT + 534)
 #define __NR_pwritev (__X32_SYSCALL_BIT + 535)
+#define __NR_pwritev2 (__X32_SYSCALL_BIT + 535)
 #define __NR_rt_tgsigqueueinfo (__X32_SYSCALL_BIT + 536)
 #define __NR_recvmmsg (__X32_SYSCALL_BIT + 537)
 #define __NR_sendmmsg (__X32_SYSCALL_BIT + 538)